Quote: My biggest problem is which film I ought to use, would you use slide or negative film? I would imagine that I would require ISO 400 film considering that I'll need a higher shutter speed with a telephoto lens.
Which film would you recommend to me?
Also is a tripod a must? I have a decent one but don't want to be too bogged down when I'm travelling with a large group.
I'd use transparency film, but, if you haven't used it recently, I'd recommend either getting some practice in or using negative film. Transparency film gives (IMO) better results but getting the exposure right is much more critical.
As you say, at this time of year 400 ASA or faster film is a sensible precaution.
Transparency: Fuji Sensia 400 or Provia 400
Negative: Fuji Superia 400 or 800
Leave the tripod, it will get in the way and slow you down so you will miss shots. On a 210mm lens you should be able to hand-hold the camera at 1/250 sec and you will have enough light to be able to use that speed (or faster) unless the light is really poor. If you have a fast standard lens take that just in case the light is b. awful.
Take a supply of soft clean dry handkerchiefs for wiping salt spray from the front element (or preferably protection filter). On the coast, it's surprising how lenses get salted up even when the sea is reasonably calm. And wipe everything down with a damp (not wet) cloth when you get home.